ini

AULA2/main3.cpp

@@ -0,0 +1,51 @@
+#include <GL/freeglut_std.h>
+#include <GL/gl.h>
+#include <GL/glut.h>
+// Called to draw scene
+void RenderScene(void) {
+  // Clear the window with current clearing color
+  glClear(GL_COLOR_BUFFER_BIT);
+  // Set current drawing color to red :R G B
+  glColor3f(1.0f, 0.0f, 0.0f);
+  // Draw a filled rectangle with current color
+  glRectd(100.0f, 150.0f, 150.0f, 100.0f);
+  // Flush drawing commands
+  glFlush();
+}
+
+// Setup the rendering state
+void SetupRC(void) {
+  // Set clear color to blue
+  glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
+}
+// Called by GLUT library when the window has cahnge size
+void ChangeSize(GLsizei w, GLsizei h) {
+  // Prevent a divide by zero
+  if (h == 0)
+    h = 1;
+  // Set Viewport to window dimensions
+  glViewport(0, 0, w, h);
+
+  // Reset coordinate system
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  // Establish clipping volume (len, right, booom, top,near, far)
+if (w <= h)
+glOrtho (0.0f, 250.0f, 0.0f, 250.0f*h/w, 1.0, -1.0);
+else glOrtho(0.0f, 250.0f * w / h, 0.0f, 250.0f, 1.0, -1.0);
+glMatrixMode(GL_MODELVIEW);
+glLoadIdentity();
+}
+
+// Main program entry point
+int  main(int argc, char **argv) {
+  glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+  glutInitWindowSize(400, 350);
+  glutInitWindowPosition( 10, 10);
+  glutCreateWindow("GLUT: GLRect");
+  glutDisplayFunc(RenderScene);
+  glutReshapeFunc(ChangeSize);
+  SetupRC();
+  glutMainLoop();
+}